In week 3 of The Gym Bag Q&A we address the differences between walking and running on weight-loss/performance, Naked Juice & Muscle Milk, and the best on-the-go protein shakes to chug after an intense workout.

In week 1 we address the top ab exercises for people with lower back pain and lean drinking. The Gym Bag is Lean It UP’s weekly reader Q&A. Every Friday we’ll pick a few of YOUR questions from Twitter, Facebook, and around the site, and weigh-in with our (concise) PoV.